Can you find out the missing number in the grid?

During which month do people sleep the least?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

After a heavy Thanksgiving meal, the night watchman went to work. In the morning, he told his boss he had dreamed that a saboteur planted a bomb in the factory and that he felt it was a warning. The boss promptly fired him. Worker confused, Why boss fire him?

What is the riddle which can be asked all day with a different correct answer each time.

I always drive my customer away.

Who am I?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Using exactly three matchsticks, can you divide the area into two equal parts?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?